From: "Lachlan Andrew" <[EMAIL PROTECTED]> Date: Tue, 11 Dec 2007 16:14:36 -0800
> This thread started because TCP processing interferes with RTT > estimation. This problem would be eliminated if time-stamping were > done as soon as the packet comes off the NIC. We don't do that because such timestamping is too expensive. It used to be the case that we did this, but we stopped doing that a long time ago. On x86 for example, timestamping can involve touching a slow I/O device to read the timestamp. We do not want to do that for every packet. Also, we timestamp differently for TCP, the global high resolution timestamp is overkill for this purpose. Really, this is a silly idea and would only be a bandaid for the problem at hand, that TCP input processing is too expensive in certain circumstances. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
